function bp_nouveau_ajax_dismiss_sitewide_notice() {
	if ( empty( $_POST['action'] ) ) {
		wp_send_json_error();
	}

	$response = array(
		'feedback' => '<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>' . __( 'There was a problem dismissing the notice. Please try again.', 'buddypress' ) . '</p></div>',
		'type'     => 'error',
	);

	if ( false === bp_is_active( 'messages' ) ) {
		wp_send_json_error( $response );
	}

	if ( empty( $_POST['nonce'] ) || ! wp_verify_nonce( $_POST['nonce'], 'bp_nouveau_messages' ) ) {
		wp_send_json_error( $response );
	}

	// Check capability.
	if ( ! is_user_logged_in() || ! bp_core_can_edit_settings() ) {
		wp_send_json_error( $response );
	}

	// Mark the active notice as closed.
	$notice = BP_Messages_Notice::get_active();

	if ( ! empty( $notice->id ) ) {
		$user_id = bp_loggedin_user_id();

		$closed_notices = bp_get_user_meta( $user_id, 'closed_notices', true );

		if ( empty( $closed_notices ) ) {
			$closed_notices = array();
		}

		// Add the notice to the array of the user's closed notices.
		$closed_notices[] = (int) $notice->id;
		bp_update_user_meta( $user_id, 'closed_notices', array_map( 'absint', array_unique( $closed_notices ) ) );

		wp_send_json_success( array(
			'feedback' => '<div class="bp-feedback info"><span class="bp-icon" aria-hidden="true"></span><p>' . __( 'Sitewide notice dismissed', 'buddypress' ) . '</p></div>',
			'type'     => 'success',
		) );
	}
}